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More modern suspension dynmics in RWD cars using irs suspensions and the dual forces of steering and power in FWD have dictated that centre-bore location is required to ensure correct centralisation of wheels on hubs. In isolation the clamping force is about 10 times greater than rotational force.
In most (all?) instances of wheel loss eother incorrectly torqued fixings ,failed fixing or incorrect fixing is the culprit
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,784
Club RR Member Number: 34
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the bolts arent subjected to shear forces though, thats the whole point.
if they're torqued up tight enough, the friction between wheel and hub face is greater than any radial load applied to the wheel, means the bolts are never loaded in shear, only tension.
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Mike D, you are right, ruishy1, you are incorrect.
A hub to wheel interface is a clamped joint, take my celica, each bolt is say a 10.9 grade m12x1.5 and there are 5 on each hub.
Now under the normal 108Nm torque each bolt will undergo during reassembly, each stud is capable of creating 5280kg of clamping load, times that by 5 to get around 26912kg.
Lets say we reduce the coefficient of friction by applying some copper slip (we all do it!) and create a Mu of 0.18, reducing the load brearing capacity to 4844kg.
With a total mass of 1400kg ish and the weight split 60/40 front to rear each front wheel has 420kg on it.
When hitting a pot hole you can experience up to 11.5g before the wheel will move, I think that you will bend you wheel before it will move TBH.
J
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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Not to mention 11.5G would probably fire your struts through your bonnet, 4.8 tonnes is a ridiculous amount of force for one wheel to be subjected to.
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don't go asking this sorta question on clubpolo... They bloody love spigot rings  Ive had numerous cars without em and never had any trouble. Never even had any wobble. My current mk2 caddy is lowered on coilovers with blackracing (wanatabe replicas) with a large centrebore and no spiggots.. I do 140miles a week in it with no issues. And drove to leeds from hampshire last week, loaded the van up with a moped and drove home, And its been used daily since still.... No issues.. |
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hehe, BANG!!! but saying that as an instantaneous force, it is entirely possible, however there are a number of things that stop these instantaneous forces, in the first case the tyre!
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